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dvbsub: add dvb_encode_rle8()

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
JULIAN GARDNER 2011-10-15 20:30:18 +02:00 committed by Michael Niedermayer
parent 7fa1f02ce2
commit 8a6799d205
1 changed files with 61 additions and 0 deletions
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61
libavcodec/dvbsub.c
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@ -194,6 +194,61 @@ static void dvb_encode_rle4(uint8_t **pq,
*pq = q;
}
static void dvb_encode_rle8(uint8_t **pq,
const uint8_t *bitmap, int linesize,
int w, int h)
{
uint8_t *q;
int x, y, len, x1, f, color;
q = *pq;
for (y = 0; y < h; y++) {
*q++ = 0x12;
x = 0;
f = 0;
while (x < w) {
x1 = x;
color = bitmap[x1++];
while (x1 < w && bitmap[x1] == color)
x1++;
len = x1 - x;
if (len == 1 && color) {
// 00000001 to 11111111 1 pixel in colour x
*q++ = color;
} else {
if (color == 0x00) {
// 00000000 0LLLLLLL L pixels (1-127) in colour 0 (L > 0)
len = FFMIN(len, 127);
*q++ = 0x00;
*q++ = len;
} else if (len > 2) {
// 00000000 1LLLLLLL CCCCCCCC L pixels (3-127) in colour C (L > 2)
len = FFMIN(len, 127);
*q++ = 0x00;
*q++ = 0x80+len;
*q++ = color;
}
else if (len == 2) {
*q++ = color;
*q++ = color;
} else {
*q++ = color;
len = 1;
}
}
x += len;
}
/* end of line */
// 00000000 00000000 end of 8-bit/pixel_code_string
*q++ = 0x00;
*q++ = 0x00;
bitmap += linesize;
}
*pq = q;
}
static int encode_dvb_subtitles(DVBSubtitleContext *s,
uint8_t *outbuf, AVSubtitle *h)
{
@ -245,6 +300,9 @@ static int encode_dvb_subtitles(DVBSubtitleContext *s,
} else if (h->rects[clut_id]->nb_colors <= 16) {
/* 4 bpp, standard encoding */
bpp_index = 1;
} else if (h->rects[clut_id]->nb_colors <= 256) {
/* 8 bpp, standard encoding */
bpp_index = 2;
} else {
return -1;
}
@ -332,6 +390,9 @@ static int encode_dvb_subtitles(DVBSubtitleContext *s,
} else if (h->rects[object_id]->nb_colors <= 16) {
/* 4 bpp, standard encoding */
dvb_encode_rle = dvb_encode_rle4;
} else if (h->rects[object_id]->nb_colors <= 256) {
/* 8 bpp, standard encoding */
dvb_encode_rle = dvb_encode_rle8;
} else {
return -1;
}